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Mechanoluminescent Visualization of Crack Propagation for Joint Evaluation
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Mode-III interfacial crack propagation in heterogeneous media
Camille Jestin1, Olivier Lengliné1, Jean Schmittbuhl1
1EOST-IPGS, Université de Strasbourg and Centre National de la Recherche Scientifique, Strasbourg 67084, France.
Physical Review. E
|July 18, 2018
Summary
This study reveals that crack roughening mechanisms, like pinning and depinning, are similar for mode III and mode I interfacial cracks. Mode III cracks exhibit more dynamically unstable rupture behavior.
Area of Science:
- Fracture Mechanics
- Materials Science
- Surface Science
Background:
- Interfacial cracks propagate along interfaces between materials.
- Understanding crack propagation is crucial for material integrity and failure analysis.
- Heterogeneity in interfaces significantly influences crack behavior.
Purpose of the Study:
- To optically monitor and analyze the propagation of slow interfacial mode III cracks.
- To compare the fracture roughening mechanisms of mode III cracks with mode I loading.
- To characterize the geometrical properties and scaling behavior of mode III fracture fronts.
Main Methods:
- Optical monitoring of slow interfacial mode III crack propagation.
- Analysis of fracture front geometry using self-affine scale invariance and Family-Vicsek scaling.
- Characterization of roughness exponents, growth exponents, and velocity distributions.
Main Results:
- Pinning and depinning on local toughness asperities are key mechanisms for fracture roughening.
- Identified roughness exponents (ζ_{-}=0.6, ζ_{+}=0.35) and growth exponent (β_{+}=0.58).
- Observed a power-law decay in avalanche area distribution and a velocity distribution exponent (η=2.55).
Conclusions:
- Fracture properties of mode III interfacial cracks are similar to those of mode I cracks.
- Mode III crack ruptures show more dynamically unstable behavior, indicated by front fluctuations and velocity correlations.
- The study provides insights into crack dynamics and scaling laws in heterogeneous materials.
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